Roller vibrator



Jan. 13, 1959 T. E. ANDERSSON ROLLER VIBRATOR 3 Sheets-Sheet 1 Filed Jan. 27. 1954 INTERNAL COMBUSTION ENG/NE INVENTOR'v TURE EVERT ANDERSSON Jan. ,13, 1959 T. E. ANDERSSON 2,868,094

ROLLER VIBRATOR Filed Jan. 27. 1954 3 Sheets-Sheet 2 INVENTOR. TURE EVERT ANDERSSON Jan. 13, 1959 T. E. ANDERSSON ROLLER VIBRATOR 3 Sheets-Sheet 3 Filed Jan. 27. 1954 INVENTOR. TURE EVERT ANDERSSON Ture EvertyAndersson, Ljungby, Sweden, assignor to Q-VibroI-Plus Corp.', Woodside LongI sland, Ya, a

The presentinvention relatesftda mechanical vibrator, i.e a mechanical device for generating vibrations, of the type comprising a circular roller track along the inside of which a spherical body isadapted to roll while being driven forward or propelled byadriver'mounted on a central driving shaft, and the main object ofthe invention isto providefa mechariicalvibfator ,which is particularly suitable for use with vibrating rollers, While -it 'is 'capableof withstanding blows and shocks inal'l directions and is subjected to -littlewear notwithstanding the fact that itc'an generate vibrations'of high amplitude.

2,868,094 I Patented Jan. 13, 1959 sponding partial section through the rolled frame along the line VII-{ VII in Fig; 1. Fig. 8 shows a longitudinal section through the frontend of the roller frame viewed from the line VIII-f-VIII in Fig. 2.

' The'roller illustrated in the drawings comprises a frame 1' which is preferably assembled from box beams and which surrounds a roller drum 2 which rolls on the midway of the length of the frame.

ground when the roller; is working and serves as a carrier for the frame "1. "The shaft of the drum 2 runs transverselyof the frame'l and is located substantially The front end of the frame is tapered and provided with a towing member 3 at'its front end, the said towing member consisting, as shown in Fig. 8, ofapiston rod that can move in a tube 4 in the frame, its inner end being provided with a piston-like flange or washer 5 which is actuated from each side by two compression springs 6 and 7 located in the tube 4, and which can absorb the jerks and shocks that may be set up between the roller and the traction device to which the front end 8 of thetowing member, shaped as an eyelet, is connected. I

The rear part of theframe 1 is formed to a platform 9 which carries adriving motor 10 for the vibrator of i the roller drum 2, usually an internal combustion engine.

The vibrator according to the invention is' 'main ly,

i characterized in that'the inside of the; roller track has a groove which serves as a race for, the spherical body and hasa progressively decreasing depth towards its sides and that thespherical' body'consists of a loose ball which is adapted to be :actuatedperipherally by thedriver.

" The invention also relate's'to a vibrating roller equipped with a mechanicahvibi'atorj according to the invention and which, is of the type in which. the vibrating roller drum itself carries a roller' frame on which is mounted the motor provided for driving the vibration generator, the said motor usually taking the form of an internal combustion engine, andthe" roller according to 'thenin- 'vention' is mainlycharacterized in that the driving shaft of the vibrator is mounted on the roller frame and serves as a supporting shaft'for the.roller"drum,said roller drum beingrotatably mounted on ccentricparts of the driving shaft the centres of which are displaced, in rela'-'" tion to the driving shaft "in a direction diametrically opposite to that of the ballactuated by,the driver ceptibl ofembodimentin many and various forms, some of ';which are illustrated in theaccompanying drawing,

. and that the structural-details herein set forth'mayk be Y varied to suit particular pprposesandstill remain Within our inventive concept.

"Other characteristic features of theinventio'niwill appear from the following description of arpreferred embodiment of a roller with a vibrator, both according to the invention, illustratedin the accompanying drawings. in the drawing Fig. 1 is aside view of the roller while Fig. 2 is a'plan view of the same and Fig. 3 is a sectional elevation of the roller drum taken along the line IIIIII in Fig. 2. Fig. 4 shows a radial section through the one vibrator in the roller drum, the said section being taken along the line IV-IV in Fig. 3, while Fig. 5 shows the driver structure viewed from the line V--V in Fig. 4. Fig. 6 is a partial section through the roller frame taken along the line VIVI in Fig'. L'WhiIeFig. 7 is a corre- This platform 9'with its motor 10 and any other equipment is balanced'by a suitable mass 10' of scrap-iron and/or concrete which is placed in "thelfront vpart 11 of the frame 1, surroundingthetube 4, the said part taking the form of a box. Bymeans of-this balancing arrangement the centre of gravity of the frame is located almost directly under the 'shaft 12 or the roller drum 2.

The frame 1 is elastically suspended from the shaft 12. of the rollerdr'um Zby means of yokes 13 which, as may be 'seen from Fig. '7, are provided with vertical holes 14 for-the reception ofsu'pporting rods 15 the lower ends of'which are provided" witha head 16 between the upper-side of'which andme beams of the frame 1 powerful compression" springs 17 are arranged. The springs '17 are enclosed in the frame beams and are thus protected by thelatter, and the length of the supporting, rods 15 maybe regulated by means of nuts 18 threaded ontothe upper ends-of thesupporting rods projecting through theyokes 13. By means of this" arrangement the frame 1 is free to move up and down elastically in relation to the yoke 13 and the roller drum 2. Transversally and longitudinally the yokes 1 3 are supported in relation to-the'fr am'el by means of plates 19 on the frame, and between said plates 19 and the yokes 13 are provided vibration dampers 21 in the form of rubber cushions'secured by vulcanization between metal plates as may be'seen fror'n -Fig. 6, whileth'e movement of the yokes 13 in the longitudinaldir'ectionis limited'by stops 20 which are 'coveredwith rubber on" their sides turned towards ftheyokes. 3.

The vibration dampers 21*which thus consist of rubber springs subjected to' and resisting shearing stresses in a plane at right-angles'to the shaftof the roller drum, are not tensioned and 'are' so dimensionedthat they possess greater rigidity in' the longitudinal direction of the roller frame than in thQvt-titzal direction sotha't they cantake up the tractive force.

A shaft 12 is provided with eccentric parts 12' adjacent to its end, for reasons discussed in detail hereinafter, which are journalled in bearings 12a in ends 2 of the drum 2.

The shaft 12, which is mounted in the yokes 13, serves as a driving shaft for the vibrators located inside the drum 2 and one end of the shaft 12 is for this purpose connected through a V-belt transmission to the motor 16. In order to compensate the pull of the V-belt that yoke 13 which is located nearest to the V-belt transmission 22 is influenced by a tension spring 23 placed between the its own unbalance.

yoke and the frame 1. The V-belt is kept tensioned by means of tensioning devices which are not shown, since they are well'knownper se.

Inside the roller drum 211116116 are arrangedtwo vibrator units working synchronously and mounted "in axially spaced relationship. These two units are identical and consist of a roller track =25 -mounted on an inwardly directed flange 26 in the-drum 2. ,The roller track 25 is provided on its inner side with a groove 28 which serves as a race for a ball-27 and has an arc-shaped or concave cross-section the are having a somewhat larger diameter than the ball 27 The depth of the groove thus decreases progressively towards both sides of the roller track and the groove is consequently able to guide the ball 27 during its rolling motion -as it is caused to lie against the roller track by centrifugal force. The ball 27 is entirely free and is propelled along the roller track 25 by means of a driver 29 fixed to the shaft 12. The driver comprises a supporting ring 30 surrounding the ball 27,

the inside of the said ring taking the form of aplain bearing surface facing the ball. When the ball is in contact with the roller trackf25, said bearing surface will locally contact the 'ball peripherally and substantially at half its height. The supporting ring 30 is provided on two opposite sides with fixing projections 31 which are connected to the lower endsiof two leaf springs 32 which are arranged parallel to one another and project radially from the part of the driver 29 surrounding the shaft 12. These leaf springs 32 are parallel to the running direction of the ball 27 and thus permit thetransverse movement 1 of the ring 313 relative to the rollertrack so that the ball can assume a suitable 'positionin the groove of the roller track during its movement. The part of the driver 29 surrounding the shaft 12 takes the form of; a clamping device gripping the shaft,- the position of whichcan thus 17 be regulated as required, and this part is provided with a U-shaped stop 33 which is turned towards theball surrounded by the ring 31) and prevents the ball from falling out of the ring, the shaft 12 stops in such a position that the ball is located at the highest point of the roller track 25. The ring 30, the shaft of which is substantially at right-angles to the driving shaft 12, the leaf ing that part of the driver which is diametrically opposed to the driving shaft 12 in the form of a counterweight 34 so that the shaft 12 isnot subjected to vibrations due to The vibrations are generated by the tricity of the parts 12' is adapted to the drums amplitude of vibration in such a way that the drum and the driving shaft 12 form a dynamically balanced system in which the shaft 12 will remain substantially at rest in spite of the vibratory movements of the drum 2 produced by the balls 27. The frequency of vibration is of course determined by the speed of rotation of the driving shaft 12.

' Since the projecting ends of the driving shaft 12 which support the yokes 13 thus remain practically stationary, the bearingsofthe roller will be subjected to very small stresses from the vibrations, and they will thus be' better suited to take up the stresses which occur when the roller is drawn forward over the surface which has to be worked The invention, is not, of course, limited to the construction shown by way of example. Thus, for example, the roller may be provided with two or more vibrating roller drums ina common frame, and the vibration genraceway supported'from the inner periphery of the drum,

springs 32 and their fixtures, are balancedxby constructsaid raceway being concentric with the drum and spaced from the shaft, a ball weight rotatably supported in the 'racewaygroovega driver for the ball including a member connected to the shaft, a ring surrounding the ball, and

spring members joiningthe .ring to the member and sup- [porting the ring rigidlyagainst movement along the raceway groove and resiliently against movement parallel to the raceway-axis; whereby rotation of the shaft causes the ball to travel'along the raceway and directly vibrate the drum.- p j 2. A vibratory roller mechanismas defined in claim 1, in which a frame is journal ed to the ends of the shaft, and eccentric journals having a commonaxis displaced from the shaft axis in a direction opposite to that of the ball are formed on the shaft at the drum hearings to reduce vibrations transmitted to the frame.

3. A vibratory roller mechanism asdefined in claim 1,

t in which a frame is resiliently suspended from the ends ball 27 which is driven along the roller track 25 and the Weight of which is taken up directly by the roller track so that the vibrations aretransmitted-through the flanges 26 to the cover of the roller drum 2.

Since the driving ;shaft 12 for the vibratorsserves at the same time as a, bearing shaft for the drum2, appreciable vibration stresses would be set up in all bearings if the drum were mountedconcentrically on the shaft 12 as the vibrations would thenbe transmitted undamped to the yokes 13 and would act indirectly on the whole of the roller frame 1. This is avoided by mounting the drum 2 with its ends 2 on eccentric parts 12' of the driving shaft 12. The centre line of the eccentric parts is displaced relatively to the centre of the rotary shaft 12 in a direction 'diametricallyopposed to the position of the balls 27 determined by the drivers 29, and the eccenof the shaft, and means connecting the frame and each end of the shaft include a bearing on the shaft, a yoke rigidly secured to the bearing, a vertically acting spring coupling the yoke .to' the ..-frame, and rubber elements fastened to relatively movable parallel surfaces on the yoke and the frame, said rubber elements resisting vertical shearing forces set up by the vibrating drum to absorb and cushion them.

References Cited in the file of this patent UNITED STATES PATENTS 2,248,478 Mall 1 July 8, 1941 2,549,182, Ekenstam Apr. '17, 1951 2,677,995 Wood n May 11, 1954 FOREIGN PATENTS 652,958 Great Britain May 2,. 1951 

